The Texas TX2575 resistors seem to be even better than the Caddock MK-132, they are available at partsconnexion.
BTW the most important thing with this dac is the output stage. Everything else is more or less cosmetics...I ended up with a C3g (fantastic tubes) in triode mode and a Lundahl LL1660 as output transformer. Wonderful sound, and much much much better than the former E182cc with capacitor output. Last step would be a Sowter I/V transformer, but they are not cheap.
And I much prefer a choke in the HV-powersupply instead the 470R resistor. I liked it so much, I even put 2 chokes in...and a decent 100µf film cap as last PS cap.

I don't know. These are from an old tube radio, and have a resistance of about 300ohms. I guess around 15hy, 10 would be also fine. Each has a voltage drop of about 20V, and I also use a 6X4 tube rectifier, so another 20V drop. Transformer is 250-0-250, but at the last PS-cap there is only 200V DC left, which is perfectly fine for the C3g ande shunt running with 70mA.
For trying out a choke I would take just what you have in the box, or get some old radio stuff, its good quality from the 50ies...

The Texas TX2575 resistors seem to be even better than the Caddock MK-132, they are available at partsconnexion.
BTW the most important thing with this dac is the output stage. Everything else is more or less cosmetics...I ended up with a C3g (fantastic tubes) in triode mode and a Lundahl LL1660 as output transformer. Wonderful sound, and much much much better than the former E182cc with capacitor output. Last step would be a Sowter I/V transformer, but they are not cheap.
And I much prefer a choke in the HV-powersupply instead the 470R resistor. I liked it so much, I even put 2 chokes in...and a decent 100µf film cap as last PS cap.

have fun,

Juergen

Isn't C3G a high gain tube (even used as triode strapped)? What value of Rk and Ra which you use to reduce the gain?

Yes, it is high gain, but the Lundahl is connected 4,5:1 as stepdown to lower the output impedance. So there is no Ra, Rk I took 150 Ohm to get about 14-15 mA. More could be better, but the Lundahl is normally only up to 10mA. Voltage at the anode is 160 Volt.
And preamp is DCB1, so no gain in the there...So there is even not enough gain, I am really thinking about Sowter I/V transformers, as these have some step up.